If you like sleeping on your side, you’re in good company — it’s the sleep position preferred by 60 percent of adults. But side-sleeping is more than a comfortable way to cozy up; according to Keith Cushner, a product expert at SleepFoundation.org, it can “improve spinal alignment, reduce the risk of snoring, and reduce back pain.” And to achieve the perfect spine, neck, and head alignment, choosing the right pillow is key. Dr. Rennes Toussaint-Keshinro, a chiropractor and mental-health coach, says side sleepers should aim to “maintain a neutral position and posture of the back,” with a pillow that lifts their head high enough to line up with the neck and spine, but not too high.